This photo of a refugee boy in Greece holding a sign that says "Sorry for Brussels" was widely shared in the aftermath of the deadly attacks on Tuesday that killed at least 31 people.

The boy held the placard expressing sympathy for the victims of the attacks during a protest by refugees at a makeshift camp near the village of Idomeni at the Greek-Macedonian border.

Andrej Isakovic / AFP / Getty Images

The boy is among 10,500 refugees at the Idomeni camp that is facing dire conditions with lack of basic services and where children are suffering from scabies, influenza and dysentery, according to the British Red Cross.